Most other forums that I frequent, you wont find the kind of guy that will take time out of his day and call your attention to an issue that may land your but in jail.
well personally, I would hate to see any one be subjected to the denial of their gun rights, which is what would happen in the event that you were to carry your gun in any illegal way. I have studied the Tennessee and federal gun laws rather extensively in an effort to ensure that it doesn't happen to me, and if anyone else can be helped by the information that I have gathered, then great.
car carry is a touchy issue. Take my state of Tennessee for instance. while we have castle doctrine, stand your ground laws, laws requiring LEOs to sign NFA paperwork, and many other excellent pro-gun laws, car carry is a strange beast here. there is no specific mention of it in the law books, only stating that the weapon has to be unloaded, with the ammo out of reach. while its understood that an HCP allows you to carry in your car, if you were to try to carry mount a weapon in your car, there could still be issues, since technically the permit is for you, instead of your vehicle.If a LEO pulling you over wanted to push the issue, it would at least take awhile to get settled out, regardless of the legality. another thing that I would suggest, to you or anyone else, is to actually print out any relevant state laws, AG opinions, etc. concerning gun carry in your state, and keep a copy of themin your vehicle at all times. just because something is legal, doesn't guarantee that a LEO will KNOW that its legal.